[linux-2.6-block.git] / arch / powerpc / include / asm / book3s / 64 / mmu.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_POWERPC_BOOK3S_64_MMU_H_
#define _ASM_POWERPC_BOOK3S_64_MMU_H_

#include <asm/page.h>

#ifndef __ASSEMBLY__
/*
 * Page size definition
 *
 *    shift : is the "PAGE_SHIFT" value for that page size
 *    sllp  : is a bit mask with the value of SLB L || LP to be or'ed
 *            directly to a slbmte "vsid" value
 *    penc  : is the HPTE encoding mask for the "LP" field:
 *
 */
struct mmu_psize_def {
	unsigned int	shift;	/* number of bits */
	int		penc[MMU_PAGE_COUNT];	/* HPTE encoding */
	unsigned int	tlbiel;	/* tlbiel supported for that page size */
	unsigned long	avpnm;	/* bits to mask out in AVPN in the HPTE */
	union {
		unsigned long	sllp;	/* SLB L||LP (exact mask to use in slbmte) */
		unsigned long ap;	/* Ap encoding used by PowerISA 3.0 */
	};
};
extern struct mmu_psize_def mmu_psize_defs[MMU_PAGE_COUNT];

/*
 * For BOOK3s 64 with 4k and 64K linux page size
 * we want to use pointers, because the page table
 * actually store pfn
 */
typedef pte_t *pgtable_t;

#endif /* __ASSEMBLY__ */

/* 64-bit classic hash table MMU */
#include <asm/book3s/64/mmu-hash.h>

#ifndef __ASSEMBLY__
/*
 * ISA 3.0 partition and process table entry format
 */
struct prtb_entry {
	__be64 prtb0;
	__be64 prtb1;
};
extern struct prtb_entry *process_tb;

struct patb_entry {
	__be64 patb0;
	__be64 patb1;
};
extern struct patb_entry *partition_tb;

/* Bits in patb0 field */
#define PATB_HR		(1UL << 63)
#define RPDB_MASK	0x0fffffffffffff00UL
#define RPDB_SHIFT	(1UL << 8)
#define RTS1_SHIFT	61		/* top 2 bits of radix tree size */
#define RTS1_MASK	(3UL << RTS1_SHIFT)
#define RTS2_SHIFT	5		/* bottom 3 bits of radix tree size */
#define RTS2_MASK	(7UL << RTS2_SHIFT)
#define RPDS_MASK	0x1f		/* root page dir. size field */

/* Bits in patb1 field */
#define PATB_GR		(1UL << 63)	/* guest uses radix; must match HR */
#define PRTS_MASK	0x1f		/* process table size field */
#define PRTB_MASK	0x0ffffffffffff000UL

/* Number of supported PID bits */
extern unsigned int mmu_pid_bits;

/* Base PID to allocate from */
extern unsigned int mmu_base_pid;

#define PRTB_SIZE_SHIFT	(mmu_pid_bits + 4)
#define PRTB_ENTRIES	(1ul << mmu_pid_bits)

/*
 * Power9 currently only support 64K partition table size.
 */
#define PATB_SIZE_SHIFT	16

typedef unsigned long mm_context_id_t;
struct spinlock;

/* Maximum possible number of NPUs in a system. */
#define NV_MAX_NPUS 8

/*
 * One bit per slice. We have lower slices which cover 256MB segments
 * upto 4G range. That gets us 16 low slices. For the rest we track slices
 * in 1TB size.
 */
struct slice_mask {
	u64 low_slices;
	DECLARE_BITMAP(high_slices, SLICE_NUM_HIGH);
};

typedef struct {
	union {
		/*
		 * We use id as the PIDR content for radix. On hash we can use
		 * more than one id. The extended ids are used when we start
		 * having address above 512TB. We allocate one extended id
		 * for each 512TB. The new id is then used with the 49 bit
		 * EA to build a new VA. We always use ESID_BITS_1T_MASK bits
		 * from EA and new context ids to build the new VAs.
		 */
		mm_context_id_t id;
		mm_context_id_t extended_id[TASK_SIZE_USER64/TASK_CONTEXT_SIZE];
	};
	u16 user_psize;		/* page size index */

	/* Number of bits in the mm_cpumask */
	atomic_t active_cpus;

	/* Number of users of the external (Nest) MMU */
	atomic_t copros;

	/* NPU NMMU context */
	struct npu_context *npu_context;

#ifdef CONFIG_PPC_MM_SLICES
	 /* SLB page size encodings*/
	unsigned char low_slices_psize[BITS_PER_LONG / BITS_PER_BYTE];
	unsigned char high_slices_psize[SLICE_ARRAY_SIZE];
	unsigned long slb_addr_limit;
# ifdef CONFIG_PPC_64K_PAGES
	struct slice_mask mask_64k;
# endif
	struct slice_mask mask_4k;
# ifdef CONFIG_HUGETLB_PAGE
	struct slice_mask mask_16m;
	struct slice_mask mask_16g;
# endif
#else
	u16 sllp;		/* SLB page size encoding */
#endif
	unsigned long vdso_base;
#ifdef CONFIG_PPC_SUBPAGE_PROT
	struct subpage_prot_table spt;
#endif /* CONFIG_PPC_SUBPAGE_PROT */
	/*
	 * pagetable fragment support
	 */
	void *pte_frag;
	void *pmd_frag;
#ifdef CONFIG_SPAPR_TCE_IOMMU
	struct list_head iommu_group_mem_list;
#endif

#ifdef CONFIG_PPC_MEM_KEYS
	/*
	 * Each bit represents one protection key.
	 * bit set   -> key allocated
	 * bit unset -> key available for allocation
	 */
	u32 pkey_allocation_map;
	s16 execute_only_pkey; /* key holding execute-only protection */
#endif
} mm_context_t;

/*
 * The current system page and segment sizes
 */
extern int mmu_linear_psize;
extern int mmu_virtual_psize;
extern int mmu_vmalloc_psize;
extern int mmu_vmemmap_psize;
extern int mmu_io_psize;

/* MMU initialization */
void mmu_early_init_devtree(void);
void hash__early_init_devtree(void);
void radix__early_init_devtree(void);
extern void radix_init_native(void);
extern void hash__early_init_mmu(void);
extern void radix__early_init_mmu(void);
static inline void early_init_mmu(void)
{
	if (radix_enabled())
		return radix__early_init_mmu();
	return hash__early_init_mmu();
}
extern void hash__early_init_mmu_secondary(void);
extern void radix__early_init_mmu_secondary(void);
static inline void early_init_mmu_secondary(void)
{
	if (radix_enabled())
		return radix__early_init_mmu_secondary();
	return hash__early_init_mmu_secondary();
}

extern void hash__setup_initial_memory_limit(phys_addr_t first_memblock_base,
					 phys_addr_t first_memblock_size);
extern void radix__setup_initial_memory_limit(phys_addr_t first_memblock_base,
					 phys_addr_t first_memblock_size);
static inline void setup_initial_memory_limit(phys_addr_t first_memblock_base,
					      phys_addr_t first_memblock_size)
{
	if (early_radix_enabled())
		return radix__setup_initial_memory_limit(first_memblock_base,
						   first_memblock_size);
	return hash__setup_initial_memory_limit(first_memblock_base,
					   first_memblock_size);
}

extern int (*register_process_table)(unsigned long base, unsigned long page_size,
				     unsigned long tbl_size);

#ifdef CONFIG_PPC_PSERIES
extern void radix_init_pseries(void);
#else
static inline void radix_init_pseries(void) { };
#endif

static inline int get_user_context(mm_context_t *ctx, unsigned long ea)
{
	int index = ea >> MAX_EA_BITS_PER_CONTEXT;

	if (likely(index < ARRAY_SIZE(ctx->extended_id)))
		return ctx->extended_id[index];

	/* should never happen */
	WARN_ON(1);
	return 0;
}

static inline unsigned long get_user_vsid(mm_context_t *ctx,
					  unsigned long ea, int ssize)
{
	unsigned long context = get_user_context(ctx, ea);

	return get_vsid(context, ea, ssize);
}

#endif /* __ASSEMBLY__ */
#endif /* _ASM_POWERPC_BOOK3S_64_MMU_H_ */
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
11a6f6ab AK	2	#ifndef _ASM_POWERPC_BOOK3S_64_MMU_H_
	3	#define _ASM_POWERPC_BOOK3S_64_MMU_H_
	4
d09780f3 CL	5	#include <asm/page.h>
d09780f3 CL	6
11a6f6ab AK	7	#ifndef __ASSEMBLY__
	8	/*
	9	* Page size definition
	10	*
	11	* shift : is the "PAGE_SHIFT" value for that page size
	12	* sllp : is a bit mask with the value of SLB L \|\| LP to be or'ed
	13	* directly to a slbmte "vsid" value
	14	* penc : is the HPTE encoding mask for the "LP" field:
	15	*
	16	*/
	17	struct mmu_psize_def {
	18	unsigned int shift; /* number of bits */
	19	int penc[MMU_PAGE_COUNT]; /* HPTE encoding */
	20	unsigned int tlbiel; /* tlbiel supported for that page size */
	21	unsigned long avpnm; /* bits to mask out in AVPN in the HPTE */
2bfd65e4 AK	22	union {
	23	unsigned long sllp; /* SLB L\|\|LP (exact mask to use in slbmte) */
	24	unsigned long ap; /* Ap encoding used by PowerISA 3.0 */
	25	};
11a6f6ab AK	26	};
11a6f6ab AK	27	extern struct mmu_psize_def mmu_psize_defs[MMU_PAGE_COUNT];
566ca99a	28
d09780f3 CL	29	/*
	30	* For BOOK3s 64 with 4k and 64K linux page size
	31	* we want to use pointers, because the page table
	32	* actually store pfn
	33	*/
	34	typedef pte_t *pgtable_t;
	35
11a6f6ab AK	36	#endif /* __ASSEMBLY__ */
11a6f6ab AK	37
11a6f6ab AK	38	/* 64-bit classic hash table MMU */
11a6f6ab AK	39	#include <asm/book3s/64/mmu-hash.h>
11a6f6ab AK	40
11a6f6ab AK	41	#ifndef __ASSEMBLY__
e9983344	42	/*
8ab102d6	43	* ISA 3.0 partition and process table entry format
e9983344 AK	44	*/
	45	struct prtb_entry {
	46	__be64 prtb0;
	47	__be64 prtb1;
	48	};
	49	extern struct prtb_entry *process_tb;
	50
	51	struct patb_entry {
	52	__be64 patb0;
	53	__be64 patb1;
	54	};
	55	extern struct patb_entry *partition_tb;
	56
dbcbfee0	57	/* Bits in patb0 field */
e9983344	58	#define PATB_HR (1UL << 63)
70cd4c10	59	#define RPDB_MASK 0x0fffffffffffff00UL
e9983344	60	#define RPDB_SHIFT (1UL << 8)
dbcbfee0 PM	61	#define RTS1_SHIFT 61 /* top 2 bits of radix tree size */
	62	#define RTS1_MASK (3UL << RTS1_SHIFT)
	63	#define RTS2_SHIFT 5 /* bottom 3 bits of radix tree size */
	64	#define RTS2_MASK (7UL << RTS2_SHIFT)
	65	#define RPDS_MASK 0x1f /* root page dir. size field */
	66
	67	/* Bits in patb1 field */
	68	#define PATB_GR (1UL << 63) /* guest uses radix; must match HR */
	69	#define PRTS_MASK 0x1f /* process table size field */
70cd4c10	70	#define PRTB_MASK 0x0ffffffffffff000UL
dbcbfee0	71
a25bd72b BH	72	/* Number of supported PID bits */
	73	extern unsigned int mmu_pid_bits;
	74
	75	/* Base PID to allocate from */
	76	extern unsigned int mmu_base_pid;
	77
	78	#define PRTB_SIZE_SHIFT (mmu_pid_bits + 4)
	79	#define PRTB_ENTRIES (1ul << mmu_pid_bits)
760573c1	80
e9983344 AK	81	/*
	82	* Power9 currently only support 64K partition table size.
	83	*/
	84	#define PATB_SIZE_SHIFT 16
11a6f6ab AK	85
	86	typedef unsigned long mm_context_id_t;
	87	struct spinlock;
	88
1ab66d1f AP	89	/* Maximum possible number of NPUs in a system. */
	90	#define NV_MAX_NPUS 8
	91
5709f7cf NP	92	/*
	93	* One bit per slice. We have lower slices which cover 256MB segments
	94	* upto 4G range. That gets us 16 low slices. For the rest we track slices
	95	* in 1TB size.
	96	*/
	97	struct slice_mask {
	98	u64 low_slices;
	99	DECLARE_BITMAP(high_slices, SLICE_NUM_HIGH);
	100	};
	101
11a6f6ab	102	typedef struct {
f384796c AK	103	union {
	104	/*
	105	* We use id as the PIDR content for radix. On hash we can use
	106	* more than one id. The extended ids are used when we start
	107	* having address above 512TB. We allocate one extended id
	108	* for each 512TB. The new id is then used with the 49 bit
	109	* EA to build a new VA. We always use ESID_BITS_1T_MASK bits
	110	* from EA and new context ids to build the new VAs.
	111	*/
	112	mm_context_id_t id;
	113	mm_context_id_t extended_id[TASK_SIZE_USER64/TASK_CONTEXT_SIZE];
	114	};
11a6f6ab AK	115	u16 user_psize; /* page size index */
11a6f6ab AK	116
a619e59c BH	117	/* Number of bits in the mm_cpumask */
	118	atomic_t active_cpus;
	119
aff6f8cb BH	120	/* Number of users of the external (Nest) MMU */
	121	atomic_t copros;
	122
1ab66d1f AP	123	/* NPU NMMU context */
	124	struct npu_context *npu_context;
	125
11a6f6ab	126	#ifdef CONFIG_PPC_MM_SLICES
15472423 CL	127	/* SLB page size encodings*/
15472423 CL	128	unsigned char low_slices_psize[BITS_PER_LONG / BITS_PER_BYTE];
11a6f6ab	129	unsigned char high_slices_psize[SLICE_ARRAY_SIZE];
4722476b	130	unsigned long slb_addr_limit;
5709f7cf NP	131	# ifdef CONFIG_PPC_64K_PAGES
	132	struct slice_mask mask_64k;
	133	# endif
	134	struct slice_mask mask_4k;
	135	# ifdef CONFIG_HUGETLB_PAGE
	136	struct slice_mask mask_16m;
	137	struct slice_mask mask_16g;
	138	# endif
11a6f6ab AK	139	#else
	140	u16 sllp; /* SLB page size encoding */
	141	#endif
	142	unsigned long vdso_base;
	143	#ifdef CONFIG_PPC_SUBPAGE_PROT
	144	struct subpage_prot_table spt;
	145	#endif /* CONFIG_PPC_SUBPAGE_PROT */
1c7ec8a4 AK	146	/*
	147	* pagetable fragment support
	148	*/
11a6f6ab	149	void *pte_frag;
8a6c697b	150	void *pmd_frag;
11a6f6ab AK	151	#ifdef CONFIG_SPAPR_TCE_IOMMU
	152	struct list_head iommu_group_mem_list;
	153	#endif
4fb158f6 RP	154
	155	#ifdef CONFIG_PPC_MEM_KEYS
	156	/*
	157	* Each bit represents one protection key.
	158	* bit set -> key allocated
	159	* bit unset -> key available for allocation
	160	*/
	161	u32 pkey_allocation_map;
5586cf61	162	s16 execute_only_pkey; /* key holding execute-only protection */
4fb158f6	163	#endif
11a6f6ab AK	164	} mm_context_t;
	165
	166	/*
	167	* The current system page and segment sizes
	168	*/
	169	extern int mmu_linear_psize;
	170	extern int mmu_virtual_psize;
	171	extern int mmu_vmalloc_psize;
	172	extern int mmu_vmemmap_psize;
	173	extern int mmu_io_psize;
	174
756d08d1	175	/* MMU initialization */
1a01dc87	176	void mmu_early_init_devtree(void);
bacf9cf8	177	void hash__early_init_devtree(void);
2537b09c	178	void radix__early_init_devtree(void);
2bfd65e4	179	extern void radix_init_native(void);
756d08d1	180	extern void hash__early_init_mmu(void);
2bfd65e4	181	extern void radix__early_init_mmu(void);
756d08d1 AK	182	static inline void early_init_mmu(void)
756d08d1 AK	183	{
2bfd65e4 AK	184	if (radix_enabled())
2bfd65e4 AK	185	return radix__early_init_mmu();
756d08d1 AK	186	return hash__early_init_mmu();
	187	}
	188	extern void hash__early_init_mmu_secondary(void);
2bfd65e4	189	extern void radix__early_init_mmu_secondary(void);
756d08d1 AK	190	static inline void early_init_mmu_secondary(void)
756d08d1 AK	191	{
2bfd65e4 AK	192	if (radix_enabled())
2bfd65e4 AK	193	return radix__early_init_mmu_secondary();
756d08d1 AK	194	return hash__early_init_mmu_secondary();
	195	}
	196
	197	extern void hash__setup_initial_memory_limit(phys_addr_t first_memblock_base,
	198	phys_addr_t first_memblock_size);
2bfd65e4 AK	199	extern void radix__setup_initial_memory_limit(phys_addr_t first_memblock_base,
2bfd65e4 AK	200	phys_addr_t first_memblock_size);
756d08d1 AK	201	static inline void setup_initial_memory_limit(phys_addr_t first_memblock_base,
	202	phys_addr_t first_memblock_size)
	203	{
b8f1b4f8	204	if (early_radix_enabled())
2bfd65e4 AK	205	return radix__setup_initial_memory_limit(first_memblock_base,
2bfd65e4 AK	206	first_memblock_size);
756d08d1 AK	207	return hash__setup_initial_memory_limit(first_memblock_base,
	208	first_memblock_size);
	209	}
eea8148c ME	210
	211	extern int (*register_process_table)(unsigned long base, unsigned long page_size,
	212	unsigned long tbl_size);
	213
cc3d2940 PM	214	#ifdef CONFIG_PPC_PSERIES
	215	extern void radix_init_pseries(void);
	216	#else
	217	static inline void radix_init_pseries(void) { };
	218	#endif
	219
c9f80734	220	static inline int get_user_context(mm_context_t *ctx, unsigned long ea)
f384796c AK	221	{
	222	int index = ea >> MAX_EA_BITS_PER_CONTEXT;
	223
	224	if (likely(index < ARRAY_SIZE(ctx->extended_id)))
	225	return ctx->extended_id[index];
	226
	227	/* should never happen */
	228	WARN_ON(1);
	229	return 0;
	230	}
	231
	232	static inline unsigned long get_user_vsid(mm_context_t *ctx,
	233	unsigned long ea, int ssize)
	234	{
c9f80734	235	unsigned long context = get_user_context(ctx, ea);
f384796c AK	236
	237	return get_vsid(context, ea, ssize);
	238	}
	239
11a6f6ab AK	240	#endif /* __ASSEMBLY__ */
11a6f6ab AK	241	#endif /* _ASM_POWERPC_BOOK3S_64_MMU_H_ */